Malicious PDF — malware analysis report

Static analysis result for SHA-256 8629b79b5e2b9a13…

MALICIOUS

PDF

77.5 KB Created: 2021-04-01 16:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7969a9305a3f386ba5ef53738de361ed SHA-1: 15786ac8dd22a20c0ae1f1564880121810ce7a4c SHA-256: 8629b79b5e2b9a135463b250020fcf788fe3988efe5c48b3517dfba900540055
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/aws?utm_term=biblia+reina+valera+1960+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416316/normal_600ddaf442592.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/88agfgc/break_time_images_coffee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444098/normal_6005587b49891.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/jiOjiwE/favexotamikapen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445534/normal_6041eb712417a.pdfIn PDF document text
    • https://negogepif.weebly.com/uploads/1/3/0/7/130775604/duwomezatumojikisi.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/yqijja8/cinemax_hd_free_movies_app.pdfIn PDF document text
    • https://xoxefalumigak.weebly.com/uploads/1/3/4/5/134527234/1ce8f.pdfIn PDF document text
    • https://pigebatidi.weebly.com/uploads/1/3/1/4/131482999/boradifarudowem_tawurab_famoparog.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/ww4Qgi7/totizuxeridil.pdfIn PDF document text
    • https://vujugorakiti.weebly.com/uploads/1/3/4/7/134719441/pemis-xexukoxomeviz-tilega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480743/normal_6027598670719.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/3gghijd/are_nunchucks_good_weapons.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/TyIvlgh/fist_of_the_north_star_ps4_game.pdfIn PDF document text
    • https://senamevab.weebly.com/uploads/1/3/4/6/134689233/padatugazavotig-xunofunebakita-juweguvunipoven-jasogutinetip.pdfIn PDF document text
    • https://cdn.sqhk.co/wifilivemij/5ijwuji/elder_scrolls_legends_moons_of_elsweyr_card_reveal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464319/normal_6004cca8a3eb6.pdfIn PDF document text
    • http://carbackseat.site/10368618291qokhb.pdfIn PDF document text
    • http://grafoanaliz.ru/27551367539hb86z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/76f7e01f-b5e2-4210-a804-d6e1d334fced/25500318312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa56d886-30cf-4d24-af31-1a5b423fea73/wipewuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79bc1ad0-c1e9-4400-bbff-c545f91d4543/where_the_wild_things_are_costume_diy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7cab085-5550-40f5-add7-2b6fce639c51/what_are_some_examples_of_classical_conditioning.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 5388 bytes
SHA-256: 005aa32275d3c68e22033704b6019e5f98100597fb2f573b1449dce5852779aa
font_01_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 11936 bytes
SHA-256: a8b317726921d1bf89803afe5bdbba86cb77bef8572fd5654e64380b56c7dc4e